Abstract: The cause, role and history of NDT qualification of in-service inspection of nuclear power plants were briefly introduced. The art of inspection qualification, methodology, requirements, character and tendency in USA, European and IAEA were described and analyzed in details. Then, discuss the related activities in china were discussed. It can be concluded that we shall promote the setting up of ourselves qualification system and pay attention to the balance of inspection qualification aims and results, technique and economic issue. Furthermore, recommends usage of the term of inspection qualification was recommended.